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Theranostics Graphene and Other 2D Materials: a Multidisciplinary Theranostics 2020, Vol. 10, Issue 12 5435 Ivyspring International Publisher Theranostics 2020; 10(12): 5435-5488. doi: 10.7150/thno.40068 Review Graphene and other 2D materials: a multidisciplinary analysis to uncover the hidden potential as cancer theranostics Laura Fusco1,2,3,#, Arianna Gazzi1,2,#, Guotao Peng4,#, Yuyoung Shin5, Sandra Vranic6, Davide Bedognetti3, Flavia Vitale7, Acelya Yilmazer8,9, Xinliang Feng10, Bengt Fadeel4,, Cinzia Casiraghi5,, Lucia Gemma Delogu2,10,11, 1. Department of Chemical and Pharmaceutical Sciences, University of Trieste, Trieste, Italy. 2. Fondazione Istituto di Ricerca Pediatrica, Città della Speranza, Padua, Italy. 3. Cancer Program, Sidra Medicine, Doha, Qatar. 4. Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden. 5. Department of Chemistry, University of Manchester, Manchester, UK. 6. Nanomedicine Lab, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK. 7. Department of Neurology, Bioengineering, Physical Medicine & Rehabilitation, Center for Neuroengineering and Therapeutics, University of Pennsylvania, Philadelphia, USA; Center for Neurotrauma, Neurodegeneration, and Restoration, Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia, USA. 8. Department of Biomedical Engineering, Ankara University, Ankara, Turkey. 9. Stem Cell Institute, Ankara University, Ankara, Turkey. 10. Faculty of Chemistry and Food Chemistry, School of Science, Technische Universität Dresden, Dresden, Germany. 11. Department of Biomedical Sciences, University of Padua, Padua, Italy. #These authors contributed equally to the present work. Corresponding author: [email protected]; [email protected]; [email protected] © The author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/). See http://ivyspring.com/terms for full terms and conditions. Received: 2019.09.07; Accepted: 2019.12.23; Published: 2020.04.07 Abstract Cancer represents one of the main causes of death in the world; hence the development of more specific approaches for its diagnosis and treatment is urgently needed in clinical practice. Here we aim at providing a comprehensive review on the use of 2-dimensional materials (2DMs) in cancer theranostics. In particular, we focus on graphene-related materials (GRMs), graphene hybrids, and graphdiyne (GDY), as well as other emerging 2DMs, such as MXene, tungsten disulfide (WS2), molybdenum disulfide (MoS2), hexagonal boron nitride (h-BN), black phosphorus (BP), silicene, antimonene (AM), germanene, biotite (black mica), metal organic frameworks (MOFs), and others. The results reported in the scientific literature in the last ten years (>200 papers) are dissected here with respect to the wide variety of combinations of imaging methodologies and therapeutic approaches, including drug/gene delivery, photothermal/photodynamic therapy, sonodynamic therapy, and immunotherapy. We provide a unique multidisciplinary approach in discussing the literature, which also includes a detailed section on the characterization methods used to analyze the material properties, highlighting the merits and limitations of the different approaches. The aim of this review is to show the strong potential of 2DMs for use as cancer theranostics, as well as to highlight issues that prevent the clinical translation of these materials. Overall, we hope to shed light on the hidden potential of the vast panorama of new and emerging 2DMs as clinical cancer theranostics. Key words: 2D materials, cancer theranostics, future perspectives, graphene, nanomedicine. 1. Introduction Graphene, a single layer of graphite, is (2DM), due to its outstanding properties that can be undoubtedly the most famous 2-dimensional material exploited in various applications, ranging from http://www.thno.org Theranostics 2020, Vol. 10, Issue 12 5436 electronics to composites and biomedical applications perspective. Furthermore, these materials are suitable [1–3]. Moreover, an entire family of graphene-related for multiple functionalizations, which is fundamental materials (GRMs), each with its own properties, is for the treatment and diagnosis of cancer, or both available – ranging from chemical derivatives of (theranostics), as we will discuss in more detail in this graphene, such as graphene oxide (GO), review. nano-graphene oxide (NGO), and reduced graphene In the present review, the state-of-the-art of oxide (rGO), to new 2DMs, such as graphdiyne graphene and 2DMs in cancer theranostics is (GDY). Furthermore, graphene hybrids can be easily presented by depicting the four main scenarios of obtained by combining single or few-layer graphene nano-based approaches in cancer, namely: i) imaging (FLG) or other GRMs with different types of methods, ii) drug and gene delivery, iii) photothermal nanomaterials (e.g., quantum dots (QDs), metallic and therapy (PTT), and iv) photodynamic therapy (PDT). semiconducting nanomaterials, etc.). Although i) Imaging in cancer. Cancer imaging is graphene quantum dots (GQDs) are not necessarily indispensable not only to enable the early detection of 2D, they have been used for biomedical applications, cancer, but also to determine the precise tumor thus these are also included in this review for sake of location and stage, as well as to direct therapy and completeness. In addition, the family of 2DMs is very check for cancer recurrence after the treatment. large, and other materials have started to be used in Various imaging techniques, including positron nanomedicine, for instance the family of transition emission tomography (PET), X-ray computed metal dichalcogenides (TMDs), such as tungstenum tomography (CT), magnetic resonance imaging (MRI) disulphide (WS2) and molybdenum disulfide (MoS2), and ultrasonography, are available for clinical hexagonal boron nitride (h-BN), nitrides and applications, while other methodologies that are carbonitrides (MXenes), black phosphorus (BP) attracting the interest of the biomedical research nanosheets, silicene, antimonene (AM), germanene, community, such as fluorescence molecular biotite, metal organic frameworks (MOF), and layered tomography (FMT), are still at the preclinical stage double hydroxide (LDH). [11–14]. Since each technology has its unique One of the main goals in modern oncology strengths and limitations, hybrid imaging platforms, overlaps with that of nanomedicine: the development such as PET-CT, FMT-CT, FMT-MRI, and PET-MRI of alternative approaches through the combination of are being developed to improve data reconstruction two or more forms of treatments and diagnostic and visualization. New nanotechnology-based agents techniques. To achieve this aim, advanced may be beneficial when it comes to proposing new nanomaterials are extensively considered as they can imaging tools that will help overcome the common be used as imaging components for cancer issues of current agents (e.g., toxicity, such as the one detection/visualization with customized therapeutic related to X-ray contrast agent, and lack of specificity, agents, as well as vectors for controlled-release common to both X-ray and MRI contrast agents, and mechanisms and targeting strategies, making increased hypersensitivity following chemotherapy). nanomaterials promising nanotheranostic tools [4]. Some 2DMs show strong light-matter interaction According to the traditional definition, a effects, such as fluorescence, making them an ideal theranostic agent consists of a therapeutic and base to build experimental theranostic tools [15]. imaging (aimed at diagnosis) component combined Moreover, the 2-dimensionality enables easy load of within a single formulation. A more recent view specific nanomaterials and molecules, which provide expanded the definition of theranostics by including complementary properties to the selected 2DMs as a tools where imaging is performed to aid or guide the vector (e.g., electrochemical properties, magnetic therapy and not necessarily to perform a diagnosis [5– functions, fluorescence, radioactivity, etc.), allowing 9]. Theranostic nanomedicines offer the opportunity to enhance and expand their potential use in oncology to combine into a single nanoplatform multiple for imaging and diagnosis. imaging methodologies and therapeutic functions, ii) Drug and gene delivery. Since 1995, when such as passive and active targeting for cancer Doxil entered into the clinic for the delivery of the therapy (theranostics for drug delivery), and potent aromatic anticancer agent doxorubicin (DOX), stimuli-responsive drug release (e.g., theranostics for several nanotools have been approved for drug temperature- and pH-dependent therapy) [10]. delivery, and the list of nanodrugs in clinical trials is In general, 2DMs shows outstanding properties, still growing [16]. The ability to multifunctionalize such as remarkable light-weightness and flexibility, nanomaterials and nanoparticles (NPs), the high drug high surface-to-volume ratio, near-infrared (NIR) loading capacity, the possibility to reduce the drug light absorption, and characteristic Raman spectrum, exposure in the undesired tissue, and the improved which make them very attractive from a biological drug solubility represent the main advantages of http://www.thno.org Theranostics 2020, Vol. 10, Issue 12 5437 using nanosystems in cancer treatment. None of the established as a clinical treatment modality for cancer nanotherapeutics approved so far,
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